I'm using a Bluetooth keyboard with my 4S. Under iOS 5 through 7.0, after the keyboard goes to sleep due to lack of use it would take about three seconds to wake. In other words, when I pressed a key it took about three seconds for the on-screen keyboard to disappear and for the phone to switch into Bluetooth mode. Since installing 7.1, that now takes closer to ten seconds. Has anyone else run into this?